EP1890058B1 - Oil seal for valve stem - Google Patents

Oil seal for valve stem Download PDF

Info

Publication number
EP1890058B1
EP1890058B1 EP07015776.3A EP07015776A EP1890058B1 EP 1890058 B1 EP1890058 B1 EP 1890058B1 EP 07015776 A EP07015776 A EP 07015776A EP 1890058 B1 EP1890058 B1 EP 1890058B1
Authority
EP
European Patent Office
Prior art keywords
seal lip
back pressure
valve stem
valve
lip
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP07015776.3A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1890058A1 (en
Inventor
Kentaro Ozawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Carl Freudenberg KG
Original Assignee
Carl Freudenberg KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Carl Freudenberg KG filed Critical Carl Freudenberg KG
Publication of EP1890058A1 publication Critical patent/EP1890058A1/en
Application granted granted Critical
Publication of EP1890058B1 publication Critical patent/EP1890058B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K41/00—Spindle sealings
    • F16K41/02—Spindle sealings with stuffing-box ; Sealing rings
    • F16K41/08—Spindle sealings with stuffing-box ; Sealing rings with at least one ring provided with axially-protruding peripheral closing-lip
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/08—Valves guides; Sealing of valve stem, e.g. sealing by lubricant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2810/00—Arrangements solving specific problems in relation with valve gears
    • F01L2810/02—Lubrication

Definitions

  • the present invention relates to an oil seal for a valve stem which is installed to a valve guide in a valve gear mechanism of an internal combustion engine.
  • JP 2000-329234 A relates to an oil seal for a valve stem.
  • An oil seal 100 for a valve stem is installed for sealing an annular space 104 between a valve guide 102 fixed to a through hole formed in an inner peripheral side of a cylinder head 101 and having one end facing a cam side A and the other end facing a cylinder side B, and a valve stem 103 coaxially inserted in an inner peripheral side of the valve guide 102 so as to reciprocate therein and having a valve (not shown) attached to it on the cylinder side B for performing an intaking and exhausting operation.
  • the oil seal 100 for a valve stem is provided with a reinforcing ring 105 and a main seal lip 106, and is installed by fitting the reinforcing ring 105 to the valve guide 102, so lubricating oil on the cam side A is sealed from flowing out toward the cylinder side B and an appropriate amount of the lubricating oil is supplied to such an extent that a film of oil is formed in the annular space 104, to thereby control the amount of leaking oil, by allowing the main seal lip 106 to contact the peripheral surface of the valve stem 103.
  • a back pressure seal lip 108 is disposed on the cylinder side B of a main seal portion 107, separately from the main seal portion 107 having the main seal lip 106, and the back pressure is born by means of the back pressure seal lip 108, and thereby the behavior of the main seal lip 106 due to the back pressure is suppressed, and a variation of the amount of leaking oil has been intended to be suppressed.
  • the back pressure seal lip 108 is integrally provided with the main seal portion 107 positioned on the cam side A of the radially extending portion 105a.
  • a stress is concentrated on a portion of the back pressure seal lip 108 where the same is fixed to an inner peripheral end portion 105b of the radially extending portion 105a when the back pressure seal lip 108 receives the back pressure, because the position of a base portion 108a of the back pressure seal lip 108 is positioned on the cylinder side B in relation to the radially extending portion 105a of the reinforcing ring 105.
  • the back pressure seal lip 108 since the back pressure seal lip 108 is integrally provided with the main seal portion 107, the base portion 108a of the back pressure seal lip 108 is positioned on the cam side A in relation to the radially extending portion 105a and thereby any reinforcing ring that bears the deformation stress of the back pressure seal lip 108 does not exist, and as shown in the contact pressure distribution in the back pressure seal lip of FIG. 5(2) , a peak of the contact pressure cannot be brought to the lip leading end portion 108b. Thereby, a problem in which a control of the amount of leaking oil becomes unstable is found.
  • an object of the present invention to provide an assembly for sealing an annular space between a valve guide and a valve stem with an oil seal, which can be installed to a place having a narrow installation space in an axial direction even if a back pressure seal lip is provided, can stably exclude an influence of a back pressure to a main seal lip by means of the back pressure seal lip, and can achieve a reduction of a change in the amount of leaking oil, in the oil seal for a valve stem installed to a valve guide in a valve gear mechanism of an internal combustion engine.
  • the invention is defined by an assembly according to claim 1.
  • the present invention accomplishes below-described advantages.
  • the back pressure seal lip is disposed in the main seal portion having the main seal lip positioned on the cam side in relation to the radially extending portion of the reinforcing ring, the length thereof can be shortened in the axial direction even if the back pressure seal lip is provided, and the oil seal for a valve stem can be installed to a place having a narrow installation space in which a compact sizing of the engines is advanced.
  • the back pressure seal lip is positioned on the cylinder side in relation to the inner peripheral end portion of the inclined portion, and a stress is concentrated on a portion where the back pressure seal lip is fixed to the inner peripheral end portion of the inclined portion. Namely, when a back pressure is exerted from the cylinder side, the deformation stress of the back pressure seal lip can be born by means of the inclined portion of the reinforcing ring, and a peak of a contact pressure can be brought to the lip leading end portion of the back pressure seal lip.
  • an influence of the back pressure to the main seal lip can stably be excluded by means of the back pressure seal lip, and a stable control of the amount of leaking oil can be performed.
  • a reduction of a change in the amount of leaking oil can be achieved.
  • FIG. 1(1) is a cross-sectional view showing a main part of an oil seal for a valve stem according to the present invention in an installed condition
  • FIG. 1(2) is a contact pressure distribution of the back pressure seal lip in the installed condition in FIG. 1(1)
  • FIG. 2 is a partially enlarged cross-sectional view of the oil seal for a valve stem of FIG. 1(1) .
  • An oil seal 1 for a valve stem is installed for sealing an annular space 4 between a valve guide 2 having one end facing a cam side A and the other end facing the cylinder side B, and a valve stem 3 coaxially arranged in an inner peripheral side of the valve guide 2 so as to reciprocate therein and having a valve (not shown) attached to it on the cylinder side B for performing an intaking and exhausting operation, and the oil seal 1 for a valve stem is also provided with a reinforcing ring 10 and a main seal portion 30.
  • the reinforcing ring 10 is formed from a sheet metal or the like, and is composed of an axially extending portion 11 fitted to the outer peripheral side of the valve guide 2, a radially extending portion 12 extending from the end of the axially extending portion 11 on the cam side A in the radially inner direction, and an inclined portion 13 extending from the end of the radially extending portion 12 on the inner peripheral side toward the cam side A in the inclined manner.
  • the fixing sealing portion 50 is formed from an inner peripheral side fixing sealing portion 51, which is fixed to the axially extending portion 11 of the reinforcing ring 10 and is brought into close contact with the outer peripheral surface of the valve guide 2, a cylinder side fixing sealing portion 52, which is fixed to the radially extending portion 12 and the inclined portion 13 on the cylinder side B and is brought into close contact with the cam side end surface 2a of the valve guide 2, and cam side fixing sealing portion 53, which is fixed to the radially extending portion 12 on the cam side A.
  • the main seal portion 30 is positioned on the cam side A in relation to the radially extending portion 12 of the reinforcing ring 10, and has a main seal lip 31 and a back pressure seal lip 40, integrally formed with each other.
  • the main seal lip 31 has a lip leading end portion 32 extending from the inner peripheral end 14 of the inclined portion 13 toward the cam side A, and is configured to be slidably brought into close contact with the valve stem 3, and a concave portion 33 formed on the outer peripheral side thereof, which is on the other side of the lip leading end portion 32, for installing a garter spring 5 therein for applying a tension force to the main seal lip 31 so that the same can follow a fluctuation of the valve stem 3.
  • the back pressure seal lip 40 is positioned on the cam side A in relation to the radially extending portion 12, but a base portion 41 is positioned on the cylinder side B in relation to the inner peripheral end 14 of the inclined portion 13, and the lip leading end 42 extends toward the cylinder side B, and is slidably brought into close contact with the valve stem 3.
  • the oil seal 1 for a valve stem constructed as described above is installed in a manner such that the axially extending portion 11 of the reinforcing ring 10 is fitted to the valve guide 2 via the inner peripheral side fixing sealing portion 51, and the main seal portion 30 having the main seal lip 31 and the back pressure seal lip 40 is slidably brought into close contact with the valve stem 3, so the main seal lip 31 can seal the lubricating oil on the cam side A from flowing out toward the cylinder side B, and allows an appropriate amount of the lubricating oil to be supplied in such an extent that a film of oil is formed in the annular space 4, and to thereby control the amount of leaking oil.
  • the back pressure seal lip 40 forms the main seal portion 30 while being integrally formed with the main seal lip 31, and is disposed at a position positioned on the cam side A in relation to the radially extending portion 12 of the reinforcing ring 10, it becomes possible to shorten the length thereof in the axially extending and to reduce a size of the oil seal 1 for a valve stem. Accordingly, even in a case that the installation space is narrowed due to compact sizing of the engine, the oil seal 1 for a valve stem can be installed.
  • the base portion 41 of the back pressure seal lip 40 is positioned on the cylinder side B in relation to the inner peripheral end portion 14 of the inclined portion 13, and a stress is concentrated on a portion of the back pressure seal lip 40 where the same is fixed to the inner peripheral end portion 14 of the inclined portion 13.
  • a peak of the contact pressure can be brought to the lip leading end portion 42 of the back pressure seal lip 40, and a stable control for the amount of leaking oil can be performed.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing With Elastic Sealing Lips (AREA)
EP07015776.3A 2006-08-15 2007-08-10 Oil seal for valve stem Active EP1890058B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2006221417A JP2008045654A (ja) 2006-08-15 2006-08-15 バルブステム用オイルシール

Publications (2)

Publication Number Publication Date
EP1890058A1 EP1890058A1 (en) 2008-02-20
EP1890058B1 true EP1890058B1 (en) 2018-07-25

Family

ID=38510320

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07015776.3A Active EP1890058B1 (en) 2006-08-15 2007-08-10 Oil seal for valve stem

Country Status (4)

Country Link
EP (1) EP1890058B1 (es)
JP (1) JP2008045654A (es)
ES (1) ES2687042T3 (es)
HU (1) HUE041547T2 (es)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10260639B2 (en) 2013-06-10 2019-04-16 Fisher Controls International Llc Actuator bushings having integral seals
ITTO20131018A1 (it) 2013-12-13 2015-06-14 Corcos Ind S A S Di Extern A Italia S R L Guarnizione per una valvola di un motore a combustione interna
JP6534550B2 (ja) * 2015-04-01 2019-06-26 Nok株式会社 バルブステムシール
US11242777B1 (en) 2020-09-11 2022-02-08 Freudenberg Sealing Technologies S.A.S. Di Externa Italia S.R.L.U. Gasket for a valve of an internal combustion engine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002071029A (ja) * 2000-08-28 2002-03-08 Nok Corp 密封装置
US6729624B1 (en) * 2001-02-20 2004-05-04 Freudenberg-Nok General Partnership Radial shaft seal

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4253924B2 (ja) * 1999-05-18 2009-04-15 Ｎｏｋ株式会社 バルブステムシール
JP2002139156A (ja) * 2000-11-02 2002-05-17 Nok Corp 回転体オイルシール
JP2004176881A (ja) * 2002-11-29 2004-06-24 Nok Corp 密封装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002071029A (ja) * 2000-08-28 2002-03-08 Nok Corp 密封装置
US6729624B1 (en) * 2001-02-20 2004-05-04 Freudenberg-Nok General Partnership Radial shaft seal

Also Published As

Publication number Publication date
HUE041547T2 (hu) 2019-05-28
ES2687042T3 (es) 2018-10-23
JP2008045654A (ja) 2008-02-28
EP1890058A1 (en) 2008-02-20

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